Changeset 4783 for trunk/help/gsasII.html

Timestamp:

Jan 26, 2021 12:48:52 PM (2 years ago)

Author:

toby

Message:

wx4.1 updates; new CIF data item; scripting: peak fit details returned; improve multistring gui

File:

• trunk/help/gsasII.html (modified) (4 diffs)

trunk/help/gsasII.html

@@ -6522 +6522 @@
   X-ray/CW-neutron refinement of PbSO4 tutorial</a>. 
 
-<dt><B>Preferred orientation</B><dd> is treated in one of two
+<dt><a name="Preferred_orientation">
+  <B>Preferred orientation</B></a>
+<dd> is treated in one of two
   ways. Intensity corrections can be added to the model here or a full
   texture model is possible with the "texture" tab (which usually
@@ -7249 +7251 @@
 
 <h4 style='margin-left:0.25in'><a name="Texture">Texture </a></h4>
+<p class=MsoNormal style='margin-left:.5in'>
+This tab is used to control settings used for a texture (pole figure)
+study of a material. This type of characterization requires
+diffraction data recorded with multiple detector orientations (the
+number of orientations will depend on sample and material
+symmetry). Do not confuse this with applying a
+<a href="#Preferred_orientation">preferred orientation correction</a>
+(found in the <a href="#Data">"Data" tab</A>) in a structural study. The sample
+orientation relative to the detector axes is specified here and the
+detector orientation is specified for each histogram as goniometer
+omega, chi, phi and azimuth values. These values must be specified.
+</P>
+<p class=MsoNormal style='margin-left:.5in'>
+Texture is modeled for different types of sample treatment, where grain
+orientation can have symmetry: cylindrical, rolling, shear or none
+(ordered from highest to lowest).
+The number of spherical harmonics coefficients is determined by the
+harmonic order and the symmetry setting. 
+</P>
 
 <h5 style='margin-left:.5in'><span><span
@@ -7254 +7275 @@
 class=MsoHyperlink><span style='color:#4F4FFF;text-decoration:none;text-underline:
 none'><o:p></o:p></span></span></span></span></h5>
+<p class=MsoNormal style='margin-left:0.75in'>
+The refined texture coefficients can be plotted in different ways:
+<UL style='margin-left:1.0in'>
+  <LI>
+as an "Axial pole
+distribution" which simulates the intensity of a reflection during a
+  phi scan.
+  <LI>as a "pole figure" or "inverse pole figure"
+  which shows the intensity of a reflection as
+  a function of sample orientation
+  <LI>as a "3D pole distribution" that shows the probability of
+  finding a crystallite with a given orientation. 
+</UL>
+</P>  
+
+
 
 <h4 style='margin-left:0.25in'><a name="Map_peaks">Map peaks</a></h4>
@@ -7503 +7540 @@
 <hr size=2 width="100%" align=center>
 
-<!-- hhmts start -->Last modified: Thu Dec 10 19:31:56 CST 2020 <!-- hhmts end -->
+<!-- hhmts start -->Last modified: Tue Jan 26 12:36:18 CST 2021 <!-- hhmts end -->
 
 </div>